Prolonged recovery of cardiac output after maximal exercise in patients with chronic heart failure
Yasuhiko Tanabe, MD*,
Minoru Takahashi, MD ,
Yukio Hosaka, MD*,
Masahiro Ito, MD*,
Eiichi Ito, MD* and
Kaoru Suzuki, MD*
* Department of Internal Medicine, Niigata Prefectural Shibata Hospital, Niigata, Japan
First Department of Internal Medicine, Niigata University School of Medicine, Niigata, Japan

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Figure 1 Scatterplots showing relationship between cardiac index at peak exercise and recovery half-times of oxygen uptake (T1/2 VO2) and CO2 output (T1/2 VCO2).
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Figure 2 Line graphs showing cardiac index at rest, at peak exercise and during 4 min of recovery, and percent (%) change in cardiac output from the peak exercise value in patients with overshoot of cardiac output at 1 min of recovery above the cardiac output at peak exercise (open square) and in patients without overshoot (closed square). * p < 0.05 compared with patients without overshoot.
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Figure 3 Line graphs showing heart rate at rest, at peak exercise and during 4 min of recovery, and percent (%) change in heart rate from the peak exercise value in patients with overshoot of cardiac output (open square) and in patients without overshoot (closed square).
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Figure 4 Line graph showing stroke volume at rest, at peak exercise and during 4 min of recovery, and percent (%) change in stroke volume from the peak exercise value in patients with overshoot of cardiac output (open square) and in patients without overshoot (closed square). * p < 0.05 compared with patients without overshoot.
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Figure 5 Line graphs showing systemic vascular resistance at rest, at peak exercise and during 4 min of recovery, and percent (%) change in systemic vascular resistance from the peak exercise value in patients with overshoot of cardiac output (open square) and in patients without overshoot (closed square). * p < 0.05 compared with patients without overshoot.
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